2. Lake Calhoun RSSI Test Walking test with Multi-Tech rCell Wireless Modem Receiver Planned to use data for estimation algorithm over a similar sized area that a SUAV may operate. Walked a rectangular grid 250m x 350m

3. Static Received Signal Strength Indication (RSSI) Test Static test with Multi-Tech rCell Wireless Modem Receiver Set up the receiver and antennas in parking 9:00AM 1 February 2014 – 7:00PM 1 February 2014 at 2:00AM (10 hours) Cell Tower ID (y-axis label) RSSI vs sample step obtained by receiver (roughly 0.5 Hz)

4. Timing Advance Solution Purchased Multi-Tech 2G cell phone modem capable of outputting cell ID, RSSI, and timing advance data on the main cell tower and neighboring cell towers. Plan to use aircraft (cell modem) GNSS position (when available) to estimate locations of cell towers using the timing advance information When GNSS is lost, use estimated locations of cell towers to then reverse the problem and estimate location of aircraft by triangulation. TA=1 ~550m TA=2 ~1100m

5. Timing Advance Data

8. Tyr

9. Extra